2004 Suburban 3/4-ton, M1 HM 5w-30, 5800 Miles

[Ramblejam]

As noted in my comments to Blackstone, this truck is primarily used around a farm. Many shorts trips, and a severe number of thermal cycles/cold starts for the mileage. Oil was changed per OLM "Change Engine Oil" message -- no DIC, so percentage is unknown.

In regards to observable performance, the engine has been quiet/smooth, pressure is right where it should be, and ZERO oil was added during the interval.

Thoughts? Looking through the forums, Castrol Edge seemingly does very well in Gen. III small-blocks. Make the change, or stick with this?

 

[901Memphis]

I'd keep doing what you're doing, maybe let it go a little further if you wanted. These engines are going to throw metal like this no matter what oil you use.

 

[CT8]

Try 10w-40 M1.

 

[bigt61]

Looks good to me, especially considering the usage - thanks for the post.

 

[Brons2]

The 10w30 M1HM is A3 rated, maybe try that for hard usage?

Or an HDEO 10w30 like Rotella T5 or Delo.

 

[Ramblejam]

Thanks everyone for the replies.

 

[addyguy]

For the engine and service, I'd say the oil did good.

However, were it my truck, I'd go thicker...I think it might do a bit better in this severe service.